Rationalize the denominator of the following expression.
$\frac{7-s}{27-2\sqrt{s}}$

$\frac{189-27s-14\sqrt{s}-2s\sqrt{s}}{729-4s^2}$

$\frac{189-27s+14\sqrt{s}-2s\sqrt{s}}{729-2s}$

$\frac{34-27s-14\sqrt{s}+2s\sqrt{s}}{729-4s}$

$\frac{189-27s+14\sqrt{s}-2s\sqrt{s}}{729-4s}$